 /*******************************************************************************
  * Copyright (c) 2004, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.components;

 import java.util.Collection ;

 import org.eclipse.ui.internal.components.framework.ComponentException;
 import org.eclipse.ui.internal.components.framework.ComponentHandle;
 import org.eclipse.ui.internal.components.framework.IServiceProvider;
 import org.eclipse.ui.internal.components.framework.ServiceFactory;

 /**
  * Service factory that exposes the dependencies, but nothing else, from another
  * factory.
  *
  * @since 3.1
  */
 public class DependencyOnlyFactory extends ServiceFactory {
     
     public ServiceFactory otherFactory;
     
     public DependencyOnlyFactory(ServiceFactory other) {
         this.otherFactory = other;
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.core.components.AbstractServiceFactory#createHandle(java.lang.Object, org.eclipse.core.components.IServiceProvider)
      */
     public ComponentHandle createHandle(Object key,
             IServiceProvider services) throws ComponentException {
         return null;
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.core.components.AbstractServiceFactory#getMissingDependencies()
      */
     public Collection getMissingDependencies() {
         return otherFactory.getMissingDependencies();
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.core.components.AbstractServiceFactory#hasService(java.lang.Object)
      */
     public boolean hasService(Object componentKey) {
         return false;
     }

 }

